Great explanation Bob. Problem with intermittent symptoms is you gotta have
continuous scanning or just wait until the part fails entirely. Pain in the
rear. With our technology today one would think our trucks would be a lot
smarter than that. Unfortunately, still playing catch up.
One good example of that. The 2001's have the AC controls that have a
separate button that turns the AC off and on. That allows you to use any
combination of vents and still run the AC. So I figure, hey, that's what I
want. Since 2000 controls are vertical and the '01's are horizontal I
figured I'd have to replace a portion of the dash to do it. No prob,
right?! Wrong! Looking behind the dash on a 2001 and the AC controls,
guess what? It's a mini-PCM in itself that controls interior climate. That
PCM plugs into the main PCM. Harnesses are all different. <sigh> Talked to
DC. Their answer: We want our trucks to have all the cushy comforts of our
cars. We're catching up. Hmmm....not if Schrempp has his way......:-(
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Bob Tom
Sent: Saturday, February 03, 2001 9:31 AM
To: dakota-truck@buffnet.net
Subject: Re: DML: Truck Stalling Update!!
At 06:33 PM 2/2/01 -0600, you wrote:
>Well I dropped my truck off at the garage this morning at 8am. Didnt hear
>from them till 3pm, and the news wasnt too good. They didnt find a frigin
>thing wrong with it. They guy said he analyzed it with his computer and
>found not one thing bad. He said he let it run for close to an hour with it
>hooked up, and even took it out for a 50 mile trip on the highway and roads
>with an onboard reader hooked up and found nothing out of wack. It never
>stumbled or died or acted up when he was driving it. Go figure! He checked
>everything he could and he was stumped that with everything I told him the
>truck was doing, nothing was coming up either with his inspection or with
>the computer's diagnostic scan.
>
>The only thing he said was that the transmission was 'stack shifting' and
>that acceleration was nothing like it could/should be. He said it is
>shifting into 2nd at 8mph. Not good eh! haha.
>He filled the truck up with gas for me and didnt even charg me the $45 he
>quoted to have it analyzed or scanned. He said bring it back in if it acts
>up again. So atleast I am not out $45, but my confidence in my truck still
>isnt all that great. Maybe I will try replacing the crankshaft position
>sensor for $40 and see what happens.
>Kyle 93 Dakota 4x4 V6
Kyle
If your crankshaft position sensor was gone, your truck would generally not
start or it would crank over but not fire up. Also, if it's suspected that
this
sensor were a candidate, it is most likely due to with its electrical
connector
(loose, broken wire, rust, etc.) rather than the sensor itself.
I personally would have a fair amount of faith in the mechanic who analyzed
your truck judging from your description of what he did and the fact that he
admitted that he was stumped. It really sounds like one of those
intermittent
problems that is going to be hard to solve.
Here are some of the common causes for stalling. I did not keep any of your
posts so keep in mind what you did in these areas (I know that you've done
quite of bit).
MAP SENSOR FAILURE SYMPTOMS: Poor running, stalling, light on dash
A MAP sensor can be inaccurate, sending an incorrect voltage to the
computer.
If this voltage is still within the range of voltage the computer expects,
a light
or trouble code for the MAP sensor may not be set. Fords are particularly
susceptible to this. problem.
THROTTLE POSITION SENSOR FAILURE SYMPTOMS: Hesitation on quick
acceleration (passing, "flooring it") , sometimes bad idle. May not
illuminate
light or set codes.
The above three sensors along with the ECT sensor are considered "essential"
sensors. They or their circuits can make an engine barely run or not
run. Other
sensors make very fine adjustments to the afr and timing, and do not often
cause a gross poor running condition. Because these "major" sensors can
trigger fault codes in other "minor" sensors, it would be better to analyze
non-computer items, like wiring, coil, fuel injectors or fuel supply before
trying
to trace down a code generated by a "minor" sensor.
Bob
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